feat(bindings-zeebe-command): Add support for passing variables to throw-error operation. (#3639)

[scott-brady]

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Description

This PR adds documentation for passing variables as optional data for the throw-error operation of the Zeebe Command binding.

Issue reference

Please reference the issue this PR will close:
dapr/components-contrib#3639

Related PR: dapr/components-contrib#3640

[github-actions]

Stale PR, paging all reviewers

[marcduiker]

@holopin-bot @scott-brady Thank you Scott!

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